Monitoring and Operating the Controller
220 UDC3500 Universal Digital Controller Product Manual 3/07
Table 4-18 Logic Gates Constraints and Dynamic Operation Status
Function Rules and Regulations
Alarms
Alarms take precedent over gate outputs. For example,
no gate output will occur if the Logic Gate Output is
directed to Relay 5 if the Alarm 1 is also configured.
Output Algorithms
Output algorithms that use Relay outputs take
precedence over gate outputs. For example, no gate
output will occur if the Logic Gate Output is directed to
Relay 1 when a conflicting Loop 1 output algorithm is also
configured (for example: Time Simplex, Time Duplex,
etc.).
Communications
Communications takes priority over gate output as
follows:
• No Gate Output will occur if directed to Manual/Auto
and the Host computer places the unit (loop) into
Manual or Automatic mode.
• No Gate Output will occur if directed to
Local/Remote and the Host computer selects either
Local or Remote setpoint.
Gate output will resume when the Host computer puts the
unit (loop) into the monitor state or the unit sheds from the
Host.
Mode or Setpoint
If a Logic Gate output is configured for Manual/Auto or
Local/Remote Setpoint, then pushing the
Man/Auto key or
the
SP Select key, respectively, will result in a key error
diagnostic display.
However, the
Man/Auto key is permitted during
communications when the Host computer has mode
control.
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